1 // RUN: %clangxx_msan -DPRE1 -O0 %s -o %t && not %run %t 2>&1 2 // RUN: %clangxx_msan -DPRE2 -O0 %s -o %t && not %run %t 2>&1 3 // RUN: %clangxx_msan -DPRE3 -O0 %s -o %t && not %run %t 2>&1 4 // RUN: %clangxx_msan -O0 %s -o %t && %run %t 2>&1 5 6 #include <assert.h> 7 #include <signal.h> 8 #include <string.h> 9 10 #include <sanitizer/linux_syscall_hooks.h> 11 #include <sanitizer/msan_interface.h> 12 13 struct my_kernel_sigaction { 14 long handler, flags, restorer; 15 uint64_t mask[20]; // larger than any known platform 16 }; 17 18 int main() { 19 my_kernel_sigaction act = {}, oldact = {}; 20 21 #if defined(PRE1) 22 __msan_poison(&act.handler, sizeof(act.handler)); 23 __sanitizer_syscall_pre_rt_sigaction(SIGUSR1, &act, &oldact, 20 * 8); 24 #elif defined(PRE2) 25 __msan_poison(&act.flags, sizeof(act.flags)); 26 __sanitizer_syscall_pre_rt_sigaction(SIGUSR1, &act, &oldact, 20 * 8); 27 #elif defined(PRE3) 28 __msan_poison(&act.mask, 1); 29 __sanitizer_syscall_pre_rt_sigaction(SIGUSR1, &act, &oldact, 20 * 8); 30 #else 31 // Uninit past the end of the mask is ignored. 32 __msan_poison(((char *)&act.mask) + 5, 1); 33 __sanitizer_syscall_pre_rt_sigaction(SIGUSR1, &act, &oldact, 5); 34 35 memset(&act, 0, sizeof(act)); 36 __msan_poison(&oldact, sizeof(oldact)); 37 __sanitizer_syscall_post_rt_sigaction(0, SIGUSR1, &act, &oldact, 5); 38 assert(__msan_test_shadow(&oldact, sizeof(oldact)) == sizeof(long)*3 + 5); 39 #endif 40 } 41
